Vietnam was a French colony. In 1954, it gained independence.
After that a civil war broke out.
The United Statues helped South Vietnam against North Vietnam in1965. this started
the Vietnam War.
President Nixon brought North and South Vietnam to sign a cease-fire agreement
in January 1973.
Two years later, war broke out again. North Vietnam wont the war and ruled over
the whole Vietnam.
After the War, the American government became not so keen on checking Communism.